Chitosan hydrogel beads impregnated with hexadecylamine for improved reactive blue 4 adsorption.
Chitosan hydrogel beads impregnated with hexadecylamine for improved reactive blue 4 adsorption.
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DOI：
10.1016/j.carbpol.2015.09.017
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发表时间：
2016-02
影响因子：
11.2
通讯作者：
M. Vakili;M. Rafatullah;M. Ibrahim;A. Abdullah;Babak Salamatinia;Z. Gholami
中科院分区：
文献类型：
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作者：
M. Vakili;M. Rafatullah;M. Ibrahim;A. Abdullah;Babak Salamatinia;Z. Gholami
以十六胺（HDA）为阳离子表面活性剂，研究了壳聚糖（CS）水凝胶小球对废水中活性蓝4（RB 4）的吸附性能。用3.8%HDA形成的CS/HDA珠是最有效的吸附剂。吸附容量从317 mg/g（CS/HDA）提高到454 mg/g（CS/HDA），提高了1.43倍。随着染料溶液pH值从4降低到9，RB 4的去除率增加。CS和CS/HDA对RB 4的吸附等温线符合Freundlich模型（R2= 0.946和0.934，χ2= 22.414和64.761）。动力学研究表明，准二级速率模型（R2= 0.996和0.997）与实验数据吻合较好。CS珠和HDA改性CS珠的ΔG°（−2.28和−6.30 kJ/mol）和ΔH°（−172.18和−101.62 kJ/mol）分别为负值;表明RB 4吸附是自发的放热过程。
Adsorption performance of chitosan (CS) hydrogel beads was investigated after impregnation of CS with hexadecylamine (HDA) as a cationic surfactant, for the elimination of reactive blue 4 (RB4) from wastewater. The CS/HDA beads formed with 3.8% HDA were the most effective adsorbent. The adsorption capacity was increased by 1.43 times from 317 mg/g (CS) to 454 mg/g (CS/HDA). The RB4 removal increased with decrease in the pH of dye solution from 4 to 9. The isotherm data obtained from RB4 adsorption on CS and CS/HDA are adequately described by Freundlich model (R2= 0.946 and 0.934,χ2= 22.414 and 64.761). The kinetic study revealed that the pseudo-second-order rate model (R2= 0.996 and 0.997) was in better agreement with the experimental data. The negative values of ΔG° (−2.28 and −6.30 kJ/mol) and ΔH° (−172.18 and −101.62 kJ/mol) for CS beads and HDA modified CS beads, respectively; suggested a spontaneous and exothermic process for RB4 adsorption.